Experienced and professional animal trainer provide their insights in answering this question :
A. You should take her/him to your vets for examination. Your dog may have skin allergy but also it may be bacterial or fungal skin infection or parasites infestation.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Sulfate-free, organic, hypoallergenic shampoo can help calm your dog`s irritated skin; additional ingredients like aloe vera and hydrocortisone are anti-inflammatories that also aid in reducing itchiness and inflamed skin. For hot spots and lesions, an organic spray or antihistamines and topical creams can help.
Whether your Bulldog has a history of skin difficulties or not, Omega-3 supplements are a great idea. They can help to address some of the symptoms of skin dryness or irritation by promoting healthy skin or simply help your Bulldog maintain good skin and coat health by preventing problems before they arise.
Chamomile and Herbal Tea Soaks

Chamomile, calendula, and green tea have properties that soothe and cool irritated skin and reduce inflammation, making them great additions in a dog bath for itchy skin. These soaks are best for dogs who have hot, itchy patches of skin that are at risk of getting rubbed raw.

Hair loss from allergies

When dogs start losing hair and suffering from severe itching, it could be an allergic reaction. Dogs, like humans, can have allergies to environmental factors such as dust mites or pollen, certain foods, or new soap.

While Vaseline is technically non-toxic for dogs, it does not mean it is 100% safe. If over-ingested (and they will lick) it can cause an upset stomach, which can lead to vomiting or diarrhoea. Vaseline forms a barrier over your dog`s skin trapping in toxins, dirt and bacteria.
Flea allergy dermatitis, seasonal allergies or atopy, food allergies, contact dermatitis (e.g., soaps and perfumes), and sarcoptic mange (mites) are some of the most common causes of pruritus in dogs. “Pruritus due to skin disease is one of the most common reasons dog owners seek veterinary care.”
Natural antiseptics include turmeric, coconut oil, aloe vera and witch hazel. For a spicy antiseptic concoction that will also help with inflammation—and prevent licking, because most dogs don`t love the smell—mix turmeric from your spice cabinet with aloe vera in a 1:1 ratio and smooth it on the scrape.
Apply an antibacterial ointment to the wound. Triple antibiotic ointments containing bacitracin, neomycin, and polymyxin B are widely available. AVOID any product that contains a corticosteroid like hydrocortisone.
The longer the skin infection goes untreated, the more serious it will become. The skin will typically not clear on its own without proper treatment.
Symptoms of Demodectic Mange

In localized cases, it shows up as patches of hair loss and red, scaling skin. In generalized cases, the entire body may be covered with redness, infections, scaling, swelling, and crusts. Often the dog loses most, if not all, hair.

One of the more common causes of patchy dog hair loss and irritated red skin is demodicosis. This is especially common in puppies. Demodicosis (or “red mange”) is one of the skin problems in dogs that can be easily treated but requires a proper diagnosis.
Coconut oil can add moisture to your dog`s skin and prevent flaking. It also helps freshen up a dog`s coat if used with a light touch. To use it topically, simply rub a very small amount onto your hands and then gently pat the coat, run your fingers through the fur, and massage a little down onto the skin.
There are many options to use when it comes to coconut oil, but for Bullies, it is best to use and unrefined coconut oil. I personally have used Spectrum`s unrefined coconut oil and seen great results in my Bulldogs!
The bully breeds are also prone to hotspots—irritated areas of the skin that can result from over-grooming, parasites, or allergies. Characterized by hair loss in the affected area and a moist, raw appearance, hotspots can be treated by regular bathing, parasite prevention, and antibacterial agents.
However, apple cider vinegar can work well on a dog`s skin when it comes to mild itchiness and irritation like hot spots because it has anti-inflammatory properties due to its acetic acid and alpha hydroxy acid, Dr. Jackson says.
Pruritus in dogs is the sensation in the skin that causes them to scratch. It is a symptom caused by dry skin, allergies, parasites, or other underlying conditions. Anxiety and boredom can cause dogs to lick, chew, and bite as a response. Changing your dog`s diet may be the key to stopping obsessive licking behavior.
When dog scratching gets out of hand, it is often the result of allergies to food or environmental triggers, including mold and pollen. Dogs may also develop a skin irritation called contact dermatitis when they encounter substances like pesticides or soap. Boredom or anxiety.
American Bulldogs can have allergies caused by an overactive immune system, according to the ABA. Signs that your dog has allergies include: Itchy skin and scratching. Fur loss.
Skin fold dermatitis must be treated with antibiotics, and the area should be bathed with salt water or an antibacterial solution like chlorhexidine. Even once the infection has cleared, though, the skin folds should be cleaned and dried daily to prevent a recurrence.
Vaseline

It`s gratifying to know that you want to help your dog`s skin issues by applying Vaseline to their cuts, scrapes, and wounds, but it`s a completely synthetic material, and it`s no good for them.

You can use hydrocortisone cream on your dog in most cases. Like in people, it helps treat mild rashes, itchy skin, and bug bites in canines, too.
Warm tap water is recommended for cleaning most wounds. Warm saline (salt solution) may also be used. This may be made by adding approximately one level teaspoonful (5 mL) of salt (or Epsom salts) to two cups (500 mL) of water.
We recommend 4% chlorhexidine, 2% benzoyl peroxide, or sodium hypochlorite (bleach) shampoos to treat bacterial skin infections. Treatments should be repeated initially 2-3 times weekly. Antibacterial conditioning sprays can be used be sprayed on the skin between bathing days.
Use a mild soap and water solution and rinse the area well. Do not use hydrogen peroxide or alcohol, as these can actually delay healing. Once the wound is clean, you will want to apply an antibiotic ointment or cream. This will help to prevent infection and will also help the wound heal faster.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. Russian blue mix cat – usually velvet soft coat but hair on back hind qtrs. is thinning, remaining hair seems less velvety than normal
ANSWER : A. Changes in coat appearance can be caused by a number of things. In older cats, hair loss or changes in coat and skin confirmation may indicate a metabolic issue such as thyroid problems. Cats can begin to lose hair and may also show other changes such as weight changes or appetite changes. Blood work is usually done to check for this, and most pets do very well with a daily medication treatment.

Hair loss can also be caused by mites on the skin, external parasites or even skin and fungal infections. These may cause red bumps or sores to appear on the skin in addition to the hair loss and coat changes. Your vet can take a skin scraping of the area to check for mites and infections, and a preventive flea treatment can remove any external parasites. If an infection or mites are present, your vet can also prescribe an antibiotic or topical cream to treat.

After any treatment it may take a month or two for completely bald patches to grow back in. This is normal as the skin and follicles need some time to heal prior to beginning the hair growth cycle again.

Q. We have a 4 yr old lab-pit mix we raise from 6 weeks.If my husband tries to take hin by the collar and make him go out to pottie he growls.Problem?
ANSWER : A. This is not good behavior. Rather than take him by the collar, call him to come with you. If he’s not good about coming when called, you can work on that. Keeps treats on hand to to entice him out and reward him when he does go potty and he’ll come to look forward to it. Clicker training is another great way to teach a dog all kinds of things, from obedience to tricks.

Have treats on hand that you know he loves, then simply click and treat. He will come to associate the sound with getting a treat. Start putting distance between you so he has to come to you. Call and click and when he comes to you for that treat, treat him and give him lots of praise. Move to hiding somewhere in the house, call and click. When he comes to you reliably inside when you call, click and treat. When this behavior is consistent, move outdoors with a very long leash. Call and click, if he doesn’t respond, give a light tug on the leash. If he takes even a single step toward you, click, treat and lots of praise. Keep doing this until he comes eagerly. Next, try him off-leash in a securely fenced area. Call and click. At this point he should be responding well and coming easily to the call and click. If he does not, go back to the last step he performed reliably and work on that again until he responds well. Eventually, you can start not treating him every time, but still praise him. Gradually lessen the frequency of the treats until he comes just to the click and praise.

Keep training sessions short, ten or fifteen minutes to start, no more than 30 minutes at a time and do it a few times a day. Try not to do it any time he is overly excited so that he can pay attention to you. Always end a training session on a good note, even if it is just getting him to do something he already does well on command. And never, NEVER punish a dog when they come to you, no matter how far they’ve made you chase them, no matter how frustrated and angry you might be. That teaches your dog that coming to you is a bad thing.

Read Full Q/A … : Causes of Limping in Dogs

Q. My puppy will be 8 weeks old tomorrow. I’ve had her for a week now, and she still isn’t responding to any training or her name. What can I do?
ANSWER : A. Try clicker training her to come when called. Clicker training is an effective way of training you dog to not only come when called, but can be used to teach a variety of tricks and tasks.

Have treats on hand that you know she loves, then simply click and treat. She will come to associate the sound with getting a treat. Start putting distance between you so she has to come to you. Call and click and when she comes to you for that treat, treat him and give her lots of praise. Move to hiding somewhere in the house, call and click. When she comes to you reliably inside when you call, click and treat. When this behavior is consistent, move outdoors with a very long leash. Call and click, if she doesn’t respond, give a light tug on the leash. If she takes even a single step toward you, click, treat and lots of praise. Keep doing this until she comes eagerly. Next, try her off-leash in a securely fenced area. Call and click. At this point she should be responding well and coming easily to the call and click. If she does not, go back to the last step she performed reliably and work on that again until she responds well. Eventually, you can start not treating her every time, but still praise her. Gradually lessen the frequency of the treats until she comes just to the click and praise.

Keep training sessions short, ten or fifteen minutes to start, no more than 30 minutes at a time and do it a few times a day. Try not to do it any time she is overly excited so that she can pay attention to you. Always end a training session on a good note, even if it is just getting him to do something she already does well on command. And never, NEVER punish a dog when they come to you, no matter how far they’ve made you chase them, no matter how frustrated and angry you might be. That teaches your dog that coming to you is a bad thing.

Q. I believe my dog has demodex mites, how can I be sure?
ANSWER : A. Unlike most skin parasites, demodex mites do not live on the skin, they live in the hair follicles, therefore it is not possible to spot them on hair or skin. Deep skin scrapings must be performed and it is necessary to visualize the mites under a microscope.

Demodicosis is most commonly seen in puppies and young dogs. Localized forms, which usually affect the skin on face and/or legs, often do not require treatment and symptoms resolve spontaneously.

On the other hand, generalized forms of Demodicosis affect the whole body, causing skin crusting, irritation and hair loss. These forms require treatment, in many cases during several weeks, or even months.

There are various treatment options depending on the severity of symptoms. Demodicosis can be treated with shampoos and other topical skin preparations, spot-on medications, tablets or anti-parasitic injections.

Finally, generalized Demodicosis in adult dogs is the most serious form as it results in suppression of the dog’s immune system. This form of Demodicosis develops secondary to internal diseases like hypothyroidism, Cushing

Q. I have an American Bulldog who’s skin is irritated, bleeding and in some places the hair is coming out. What can I do?
ANSWER : A. You should take her/him to your vets for examination. Your dog may have skin allergy but also it may be bacterial or fungal skin infection or parasites infestation.

Q. For the past few months my dog has slowly licked most all of his hair off his legs and lower belly. The skin is now dotted with red sore spots.
ANSWER : A. Skin problems can have a variety of causes, sometimes more than one. It is important to have the problem checked by your vet to determine if there is a medical cause for your pet’s skin issues and treat accordingly.

In pets of all ages, fleas, food allergies and exposure to chemical irritants such as cleaners and soaps can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin.

Check for fleas with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle.

If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic.

Food allergies are often caused by sensitivity to a protein in the food. Hill’s Science Diet offers some non-prescription options for sensitive skin as well as prescription hypoallergenic foods for more severe cases. Royal Canin carries limited protein diets that may also offer some relief. Your vet can recommend a specific diet that will help.

Q. Year 3 my dog loses patches of hair on back, stomach and neck. Vet has tested, but has not found anything. Patches are a red and scaly by hair lin
ANSWER : A. Skin problems can have a variety of causes, sometimes more than one. It is important to have the problem checked by your vet to determine if there is a medical cause for your pet’s skin issues and treat accordingly.

In pets of all ages, fleas, food allergies and exposure to chemical irritants such as cleaners and soaps can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin.

Check for fleas with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle.

If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic.

Food allergies are often caused by sensitivity to a protein in the food. Hill’s Science Diet offers some non-prescription options for sensitive skin as well as prescription hypoallergenic foods for more severe cases. Royal Canin carries limited protein diets that may also offer some relief. Your vet can recommend a specific diet that will help.

If there is no relief or not enough, consider getting your pet checked by a veterinary dermatologist and having allergy testing done.

Q. My dog has white paw pads with sharp edges that he chews. What is it?
ANSWER : A. There are many reasons for hard skin on feet and pads, from walking on abrasive or irritant surfaces to poor/dry skin and some nutrient deficiencies, especially in certain breeds. Fungal and bacterial infections can also affect the skin on a dogs feet. Hard skin on the pads would likely cause significant irritation to the delicate skin between his toes and cause itching and biting at them. I recommend a high quality, skin specific diet and a full check up to investigate underlying factors. A skin biopsy may be required to diagnose accurately what is going on